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Fuel rod capable of overcoming mechanical interaction of pellet and cladding and fuel assembly

A fuel rod and cladding technology, which is applied in the direction of fuel elements, reactor fuel elements, reactor fuel materials, etc., can solve the problems of alleviating or eliminating the mechanical interaction of pellet cladding, difficulty in applying fuel rods with rapid power change requirements, etc. Achieve the effects of simplifying operation, reducing thermal energy storage, and expanding the scope of application

Pending Publication Date: 2021-09-17
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the existing technology cannot fundamentally alleviate or eliminate the mechanical interaction of the pellet cladding and is difficult to apply to fuel rods with rapid power change requirements, the present invention provides a method for overcoming the mechanical interaction of the pellet cladding to solve the above problems. fuel rod

Method used

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  • Fuel rod capable of overcoming mechanical interaction of pellet and cladding and fuel assembly
  • Fuel rod capable of overcoming mechanical interaction of pellet and cladding and fuel assembly
  • Fuel rod capable of overcoming mechanical interaction of pellet and cladding and fuel assembly

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Embodiment 1

[0035] Compared with the problem that the traditional fuel rod structure cannot fundamentally alleviate or eliminate the mechanical interaction of the pellet cladding and is difficult to be used in a reactor with rapid power change requirements, this embodiment proposes a method to overcome the mechanical interaction of the pellet cladding In this embodiment, the thermal expansion difference space is preset in the cladding-pellet gap of the fuel rod so that there is no mechanical interaction between the cladding and cladding of the fuel rod under a large power variation range, thereby alleviating or The elimination of the mechanical interaction of the pellet cladding can be applied to nuclear reactors with rapid power change requirements, which improves the scope of application and reduces the operational constraints of the reactor.

[0036] Specific as Figure 1-3 As shown, the fuel rod of this embodiment includes a cladding 1, a fuel pellet 2 and a cladding-fuel pellet gap 3...

Embodiment 2

[0040] In order to further alleviate or eliminate the mechanical interaction of the pellet cladding, based on the above-mentioned embodiment 1, the fuel rod of this embodiment adopts fuel pellets with high thermal conductivity to reduce the temperature of the fuel pellets. For example, by placing conventional fuels such as uranium dioxide in metals with high thermal conductivity to make equivalent fuel pellets and other measures.

[0041] The metal with high thermal conductivity in this embodiment can be made of stainless steel or the like.

Embodiment 3

[0043] In order to further alleviate or eliminate the mechanical interaction of the cladding of the pellets, this embodiment uses a fuel material with a lower thermal expansion coefficient and a cladding material with a higher thermal expansion coefficient on the basis of the above embodiments. For example, by placing conventional fuel such as uranium dioxide in a metal with high thermal conductivity to make an equivalent fuel pellet so that the equivalent thermal expansion coefficient is close to that of the base metal, the thermal expansion of the pellet can be effectively reduced; or the current zirconium alloy cladding can be Doping modification increases the coefficient of thermal expansion, which can alleviate or eliminate the mechanical interaction between the core block and the shell.

[0044] The thermal expansion coefficient of the metal phase of the uranium dioxide fuel matrix in this embodiment is smaller than that of the cladding, for example, the cladding is made ...

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Abstract

The invention discloses a fuel rod capable of overcoming mechanical interaction of a pellet and a cladding and a fuel assembly. The fuel rod comprises the cladding and a fuel pellet; and a gap between the cladding and the fuel pellet contains a preset thermal expansion difference space. The thermal expansion difference space is preset in the fuel rod, so that the fuel rod still does not generate pellet-cladding mechanical interaction under the large power change amplitude, the pellet-cladding mechanical interaction of the fuel rod is relieved and eliminated, and the fuel rod has the capacity of adapting to rapid power conversion; and therefore, the fuel rod has wider adaptability, and meanwhile, operation of the reactor is simplified, and operation limitation of the reactor is reduced.

Description

technical field [0001] The invention belongs to the technical field of fuel assemblies, and in particular relates to a fuel rod and a fuel assembly which overcome the mechanical interaction of pellet cladding. Background technique [0002] Fuel rods are used to contain nuclear fuel and fission products. Conventional fuel rod designs mostly use uranium dioxide ceramic fuel and zirconium alloy cladding for the sake of neutron economy. Since the ceramic fuel is where the nuclear reaction occurs, its temperature is higher, and the thermal expansion coefficient of uranium dioxide is larger than that of zirconium alloy, so when a rapid power change occurs, the zirconium alloy cladding will be affected by the radial push and pull of the ceramic fuel pellet However, a large strain occurs, and then fatigue failure occurs, which endangers the structural integrity of the fuel rod, and loses the most important function of shielding nuclear fuel and fission products. At present, nuclea...

Claims

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Application Information

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IPC IPC(8): G21C3/06G21C3/07G21C3/38G21C3/58
CPCG21C3/06G21C3/07G21C3/38G21C3/58Y02E30/30
Inventor 陈平蒲曾坪张坤焦拥军吕亮亮邢硕何梁郑美银邱玺王坤
Owner NUCLEAR POWER INSTITUTE OF CHINA
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